scholarly journals Fabrication of 3D monolithic graphene foam/polycaprolactone porous nanocomposites for bioapplications

2020 ◽  
Vol 56 (9) ◽  
pp. 5581-5594
Author(s):  
Neda Bahremandi Tolou ◽  
Hamidreza Salimijazi ◽  
Theodoros Dikonimos ◽  
Giuliana Faggio ◽  
Giacomo Messina ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Three Dimensional ◽  
Chemical Vapor ◽  
Porous Polymer ◽  
Nerve Tissue ◽  
Inductive Heating ◽  
Chemical Vapor Deposition Growth ◽  
Graphene Foam ◽  
3D Graphene ◽  
Process Architecture

Abstract Aiming at the production of light, porous, conductive, biosafe composites, in this paper we are presenting a novel fabrication method for monolithic, three-dimensional (3D) graphene foam (GF)/porous polymer composites. The synthesis adopts a novel process architecture by using Ni foam templates in an inductive heating chemical vapor deposition growth process, and by removing Ni chemically while retaining graphene integrity by the reversible application of cyclododecane (CD); finally, nondestructive coating procedures with polycaprolactone (PCL) solutions have been developed. The composites can be optimized to enhance electrical conduction, flexibility and mechanical properties, while mixing PCL and CD allows to coat the GF with a novel mesoporous polymer coating. By tuning the GF properties, the typical electrical resistance of the 3D forms can be reduced to a few 10 s of Ohms, values that are maintained after the PCL coatings. The current study achieved a GF fraction ranging between 1 and 7.3 wt%, with even the lower graphene content composites showing acceptable electrical and mechanical properties. The properties of these conductive 3D-GF/PCL composites are in line with the requirements for applications in the field of nerve tissue engineering. Graphical abstract

Compressive Mechanical Properties of Carbon Nanotube Sponges: Experiments and Modeling

2012 ◽  
Vol 528 ◽  
pp. 14-17
Author(s):  
Peng Zhan Sun ◽  
Hong Wei Zhu
Keyword(s):  
Mechanical Properties ◽  
Chemical Vapor Deposition ◽  
Carbon Nanotube ◽  
Theoretical Model ◽  
Vapor Deposition ◽  
Three Dimensional ◽  
Chemical Vapor ◽  
Environmental Applications ◽  
Deep Insight ◽  
Simple Theoretical Model

Carbon nanotube (CNT) sponges are three-dimensional frameworks of interconnected CNTs with great potentials in composite and environmental applications. CNT sponges with lateral sizes of centimeters have been prepared through chemical vapor deposition (CVD), and their compressive mechanical properties are studied. To gain deep insight on the microstructure and how CNTs are connected within the sponges, we propose a simple theoretical model to understand the arrangement as well as the interconnection of CNTs. The mechanical properties of CNT sponges can be well explained and predicted using this model.

Three dimensional (3D) flexible graphene foam/polypyrrole composite: towards highly efficient supercapacitors

RSC Advances ◽  
2015 ◽  
Vol 5 (6) ◽  
pp. 3999-4008 ◽  
Author(s):  
Sakineh Chabi ◽  
Chuang Peng ◽  
Zhuxian Yang ◽  
Yongde Xia ◽  
Yanqiu Zhu
Keyword(s):  
Electrochemical Performance ◽  
Three Dimensional ◽  
Graphene Foam ◽  
3D Graphene ◽  
3 Dimensional ◽  
Highly Efficient ◽  
Polypyrrole Composite

Polypyrrole (PPY) functionalized 3 dimensional (3D) graphene foam (GF) with remarkable electrochemical performance has been synthesized in this work.

scholarly journals Nitrogen Functionalization of CVD Grown Three-Dimensional Graphene Foam for Hydrogen Evolution Reactions in Alkaline Media

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4952
Author(s):  
Daniela Ion-Ebrașu ◽  
Radu Dorin Andrei ◽  
Stanică Enache ◽  
Simona Căprărescu ◽  
Constantin Cătălin Negrilă ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Photoelectron Spectroscopy ◽  
Hydrothermal Process ◽  
Three Dimensional ◽  
Chemical Vapor ◽  
Alkaline Media ◽  
Active Nitrogen ◽  
Graphene Foam ◽  
Graphene Layers ◽  
Nitrogen Doped

Three-dimensional graphene foam (3D-GrFoam) is a highly porous structure and sustained lattice formed by graphene layers with sp2 and sp3 hybridized carbon. In this work, chemical vapor deposition (CVD)—grown 3D-GrFoam was nitrogen-doped and platinum functionalized using hydrothermal treatment with different reducing agents (i.e., urea, hydrazine, ammonia, and dihydrogen hexachloroplatinate (IV) hydrate, respectively). X-ray photoelectron spectroscopy (XPS) survey showed that the most electrochemically active nitrogen-doped sample (GrFoam3N) contained 1.8 at % of N, and it exhibited a 172 mV dec−1 Tafel plot associated with the Volmer–Heyrovsky hydrogen evolution (HER) mechanism in 0.1 M KOH. By the hydrothermal process, 0.2 at % of platinum was anchored to the graphene foam surface, and the resultant sample of GrFoamPt yielded a value of 80 mV dec−1 Tafel associated with the Volmer–Tafel HER mechanism. Furthermore, Raman and infrared spectroscopy analysis, as well as scanning electron microscopy (SEM) were carried out to understand the structure of the samples.

scholarly journals Nitrogen-Doped Flower-Like Hybrid Structure Based on Three-Dimensional Graphene

2020 ◽  
Vol 6 (2) ◽  
pp. 40
Author(s):  
Kinshuk Dasgupta ◽  
Mahnoosh Khosravifar ◽  
Shrilekha Sawant ◽  
Paa Kwasi Adusei ◽  
Sathya Narayan Kanakaraj ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Three Dimensional ◽  
Chemical Vapor ◽  
Hybrid Structure ◽  
High Specific Surface Area ◽  
Active Nitrogen ◽  
3D Graphene ◽  
Nitrogen Doped ◽  
N Doping

A new flower-like hybrid structure consisting of nitrogen-doped 3-dimensional (3D) graphene and vertically aligned graphene has been synthesized using a combination of low-pressure chemical vapor deposition (LPCVD) and plasma-enhanced chemical vapor deposition (PECVD) techniques. Active nitrogen (N) species were found to be essential for the growth of the flower-like morphology. N-doping was responsible for enhanced electrical conductivity and wettability of the obtained nano-carbon hybrid structure. Based on the conducted studies a growth mechanism has been proposed. The high specific surface area, low resistance to charge transfer and enhanced specific capacitance of this nitrogen-doped hybrid structure, makes it an excellent candidate material for supercapacitors.

Structure and Mechanical Properties of Nitrogen Incorporated Diamond-Like Carbon Films

1994 ◽  
Vol 356 ◽  
Author(s):  
Kwang-Ryeol Lee ◽  
Kwang Yong Eun ◽  
Jae-Seong Rhee
Keyword(s):  
Mechanical Properties ◽  
Nitrogen Source ◽  
Three Dimensional ◽  
Chemical Vapor ◽  
Nitrogen Addition ◽  
Carbon Films ◽  
Diamond Like Carbon ◽  
Negative Bias Voltage ◽  
Ammonia Addition ◽  
Bond Network

AbstractNitrogen incorporated diamond-like carbon (DLC) films were deposited by r.f. plasma assisted chemical vapor deposition (r.f.-PACVD) method. Mixtures of benzene and ammonia or nitrogen were used as the reaction gases for the deposition. Composition, atomic bond structure and mechanical properties of the film were investigated when the fraction of nitrogen source increases from 0 to 0.79. All films were deposited at fixed negative bias voltage of the cathode (-500 V) and the deposition pressure (10 mTorr). While ammonia addition reduces both residual stress and hardness of the film from 1.7 to 1 GPa and from 2750 to 1700 Kgf/mm2 respectively, the mechanical properties are not significantly varied by nitrogen addition. Deposition rate, composition and atomic bond structure are also dependent on the nitrogen source gases. Observed behavior of mechanical properties is discussed in terms of the content of inter-links of sp2 clusters. In addition to hydrogen, C≡N bonds in the film are also terminated sites of three dimensional atomic bond network. By considering the hydrogen concentration and the C≡N bonds, it can be shown that the mechanical properties of nitrogen incorporated DLC films are determined by the content of inter-links of sp2 clusters.

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